Four swivel casters, two steering wheels, and equal installation heights are a high-cost wheel arrangement. It is recommended to enable the vehicle to rotate smoothly under the action of heavy-duty and long-instrument vehicles. An alternative is to use a wheelset instead of a steering wheel and two single wheels on a single axle. Suitable for light loads, the instrument truck can travel in all directions. Instrument cars are difficult to control when driving in a straight line. In this arrangement, the instrument has a tendency to flip over. Two swivel casters and directional casters of the same height are common configurations of swivel casters. Linear motion in this arrangement is comparable to curved motion.

Four universal wheels, two steering wheels, and equal installation heights are a high-cost wheel arrangement. Shangxin universal wheels manufacturer recommends that the vehicle can rotate smoothly under the influence of heavy load and long instrument vehicle. An alternative is to use a wheelset instead of a steering wheel and two single wheels on a single axle.

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